Réponse :
Explications étape par étape
Bonsoir
A = 3/7 + 4/21 - 5/2
A = (3 x 3)/(7 x 3) + 4/21 - 5/2
A = 9/21 + 4/21 - 5/2
A = 13/21 - 5/2
A = (13 x 2)/(21 x 2) - (5 x 21)/(2 x 21)
A = 26/42 - 106/21
A = 80/21
B = (-4 + 3 x 2/7) : (3/14)
B = (-4 + 6/7) x 14/3
B = (-28/7 + 6/7) x 14/3
B = -22/7 x 14/3
B = -14/7 x 22/3
B = -2 x 22/3
B = -44/3
C = [4 - (2 - 5)^2] / (4 + 5)
C = (4 - (-3)^2) / 9
C = (4 - 9) / 9
C = (-5)/9
C = -5/9
E = 6/5 : (1/15 - 1/5)
E = 6/5 : (1/15 - 3/15)
E = 6/5 : (-2/15)
E = 6/5 x -15/2
E = 15/5 x -6/2
E = 3 x -3
E = -9
F = 1/3 - 1/3 x 4/7
F = 1/3 - 4/21
F = 7/21 - 4/21
F = 3/21
F = 1/7
